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annotate m4/ac_python_devel.m4 @ 355:d1f930be4711

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From Jeffrey Morlan: pst_build_id_ptr and pst_build_desc_ptr require that the first child of a BTree page have the same starting ID as itself. This is not required by the spec, and is not true in many real-world PSTs (presumably, the original first child of the page got deleted). Because of this, many emails are not being extracted from these PSTs. It also triggers an infinite loop in lspst (a separate bug, also fixed)
author Carl Byington <carl@five-ten-sg.com>
date Wed, 06 Jul 2016 10:12:22 -0700
parents bfc35fd55254
children
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1 # ===========================================================================
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2 # http://www.nongnu.org/autoconf-archive/ac_python_devel.html
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3 # ===========================================================================
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4 #
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5 # SYNOPSIS
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6 #
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7 # AC_PYTHON_DEVEL([version])
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8 #
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9 # DESCRIPTION
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10 #
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11 # Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
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12 # in your configure.ac.
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13 #
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14 # This macro checks for Python and tries to get the include path to
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15 # 'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LDFLAGS)
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16 # output variables. It also exports $(PYTHON_EXTRA_LIBS) and
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17 # $(PYTHON_EXTRA_LDFLAGS) for embedding Python in your code.
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18 #
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19 # You can search for some particular version of Python by passing a
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20 # parameter to this macro, for example ">= '2.3.1'", or "== '2.4'". Please
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21 # note that you *have* to pass also an operator along with the version to
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22 # match, and pay special attention to the single quotes surrounding the
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23 # version number. Don't use "PYTHON_VERSION" for this: that environment
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24 # variable is declared as precious and thus reserved for the end-user.
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25 #
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26 # This macro should work for all versions of Python >= 2.1.0. As an end
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27 # user, you can disable the check for the python version by setting the
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28 # PYTHON_NOVERSIONCHECK environment variable to something else than the
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29 # empty string.
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30 #
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31 # If you need to use this macro for an older Python version, please
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32 # contact the authors. We're always open for feedback.
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33 #
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34 # LICENSE
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35 #
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36 # Copyright (c) 2009 Sebastian Huber <sebastian-huber@web.de>
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37 # Copyright (c) 2009 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
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38 # Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
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39 # Copyright (c) 2009 Andrew Collier <colliera@ukzn.ac.za>
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40 # Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
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41 # Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
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42 #
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43 # This program is free software: you can redistribute it and/or modify it
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44 # under the terms of the GNU General Public License as published by the
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45 # Free Software Foundation, either version 3 of the License, or (at your
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46 # option) any later version.
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47 #
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48 # This program is distributed in the hope that it will be useful, but
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49 # WITHOUT ANY WARRANTY; without even the implied warranty of
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50 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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51 # Public License for more details.
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52 #
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53 # You should have received a copy of the GNU General Public License along
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54 # with this program. If not, see <http://www.gnu.org/licenses/>.
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55 #
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56 # As a special exception, the respective Autoconf Macro's copyright owner
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57 # gives unlimited permission to copy, distribute and modify the configure
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58 # scripts that are the output of Autoconf when processing the Macro. You
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59 # need not follow the terms of the GNU General Public License when using
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60 # or distributing such scripts, even though portions of the text of the
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61 # Macro appear in them. The GNU General Public License (GPL) does govern
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62 # all other use of the material that constitutes the Autoconf Macro.
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63 #
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64 # This special exception to the GPL applies to versions of the Autoconf
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65 # Macro released by the Autoconf Archive. When you make and distribute a
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66 # modified version of the Autoconf Macro, you may extend this special
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67 # exception to the GPL to apply to your modified version as well.
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68
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69 AC_DEFUN([AC_PYTHON_DEVEL],[
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70 #
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71 # Allow the use of a (user set) custom python version
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72 #
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73 AC_ARG_VAR([PYTHON_VERSION],[The installed Python
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74 version to use, for example '2.3'. This string
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75 will be appended to the Python interpreter
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76 canonical name.])
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77
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78 AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
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79 if test -z "$PYTHON"; then
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80 AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
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81 PYTHON_VERSION=""
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82 fi
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83
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84 #
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85 # Check for a version of Python >= 2.1.0
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86 #
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87 AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
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88 ac_supports_python_ver=`$PYTHON -c "import sys; \
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89 ver = sys.version.split ()[[0]]; \
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90 print (ver >= '2.1.0')"`
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91 if test "$ac_supports_python_ver" != "True"; then
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92 if test -z "$PYTHON_NOVERSIONCHECK"; then
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93 AC_MSG_RESULT([no])
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94 AC_MSG_FAILURE([
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95 This version of the AC@&t@_PYTHON_DEVEL macro
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96 doesn't work properly with versions of Python before
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97 2.1.0. You may need to re-run configure, setting the
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98 variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
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99 PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
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100 Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
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101 to something else than an empty string.
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102 ])
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103 else
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104 AC_MSG_RESULT([skip at user request])
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105 fi
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106 else
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107 AC_MSG_RESULT([yes])
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108 fi
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109
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110 #
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111 # if the macro parameter ``version'' is set, honour it
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112 #
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113 if test -n "$1"; then
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114 AC_MSG_CHECKING([for a version of Python $1])
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115 ac_supports_python_ver=`$PYTHON -c "import sys; \
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116 ver = sys.version.split ()[[0]]; \
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117 print (ver >= $1)"`
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118 if test "$ac_supports_python_ver" = "True"; then
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119 AC_MSG_RESULT([yes])
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120 else
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121 AC_MSG_RESULT([no])
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122 AC_MSG_ERROR([this package requires Python $1.
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123 If you have it installed, but it isn't the default Python
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124 interpreter in your system path, please pass the PYTHON_VERSION
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125 variable to configure. See ``configure --help'' for reference.
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126 ])
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127 PYTHON_VERSION=""
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128 fi
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129 fi
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130
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131 #
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132 # Check if you have distutils, else fail
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133 #
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134 AC_MSG_CHECKING([for the distutils Python package])
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135 ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
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136 if test -z "$ac_distutils_result"; then
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137 AC_MSG_RESULT([yes])
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138 else
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139 AC_MSG_RESULT([no])
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140 AC_MSG_ERROR([cannot import Python module "distutils".
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141 Please check your Python installation. The error was:
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142 $ac_distutils_result])
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143 PYTHON_VERSION=""
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144 fi
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145
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146 #
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147 # Check for Python include path
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148 #
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149 AC_MSG_CHECKING([for Python include path])
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150 if test -z "$PYTHON_CPPFLAGS"; then
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151 python_path=`$PYTHON -c "import distutils.sysconfig; \
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152 print (distutils.sysconfig.get_python_inc ());"`
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153 if test -n "${python_path}"; then
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154 python_path="-I$python_path"
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155 fi
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156 PYTHON_CPPFLAGS=$python_path
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157 fi
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158 AC_MSG_RESULT([$PYTHON_CPPFLAGS])
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159 AC_SUBST([PYTHON_CPPFLAGS])
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160
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161 #
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162 # Check for Python library path
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163 #
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164 AC_MSG_CHECKING([for Python library path])
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165 if test -z "$PYTHON_LDFLAGS"; then
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166 # (makes two attempts to ensure we've got a version number
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167 # from the interpreter)
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168 ac_python_version=`cat<<EOD | $PYTHON -
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169
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170 # join all versioning strings, on some systems
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171 # major/minor numbers could be in different list elements
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172 from distutils.sysconfig import *
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173 ret = ''
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174 for e in get_config_vars ('VERSION'):
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175 if (e != None):
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176 ret += e
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177 print (ret)
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178 EOD`
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179
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180 if test -z "$ac_python_version"; then
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181 if test -n "$PYTHON_VERSION"; then
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182 ac_python_version=$PYTHON_VERSION
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183 else
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184 ac_python_version=`$PYTHON -c "import sys; \
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185 print (sys.version[[:3]])"`
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186 fi
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187 fi
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188
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189 # Make the versioning information available to the compiler
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190 AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
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191 [If available, contains the Python version number currently in use.])
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192
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193 # First, the library directory:
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194 ac_python_libdir=`cat<<EOD | $PYTHON -
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195
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196 # There should be only one
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197 import distutils.sysconfig
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198 for e in distutils.sysconfig.get_config_vars ('LIBDIR'):
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199 if e != None:
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200 print (e)
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201 break
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202 EOD`
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203
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204 # Before checking for libpythonX.Y, we need to know
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205 # the extension the OS we're on uses for libraries
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206 # (we take the first one, if there's more than one fix me!):
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207 ac_python_soext=`$PYTHON -c \
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208 "import distutils.sysconfig; \
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209 print (distutils.sysconfig.get_config_vars('SO')[[0]])"`
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210
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211 # Now, for the library:
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212 ac_python_soname=`$PYTHON -c \
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213 "import distutils.sysconfig; \
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214 print (distutils.sysconfig.get_config_vars('LDLIBRARY')[[0]])"`
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215
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216 # Strip away extension from the end to canonicalize its name:
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217 ac_python_library=`echo "$ac_python_soname" | sed "s/${ac_python_soext}$//"`
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218
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219 # This small piece shamelessly adapted from PostgreSQL python macro;
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220 # credits goes to momjian, I think. I'd like to put the right name
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221 # in the credits, if someone can point me in the right direction... ?
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222 #
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223 if test -n "$ac_python_libdir" -a -n "$ac_python_library" \
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224 -a x"$ac_python_library" != x"$ac_python_soname"
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225 then
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226 # use the official shared library
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227 ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
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228 PYTHON_LDFLAGS="-L$ac_python_libdir -l$ac_python_library"
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229 else
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230 # old way: use libpython from python_configdir
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231 ac_python_libdir=`$PYTHON -c \
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232 "from distutils.sysconfig import get_python_lib as f; \
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233 import os; \
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234 print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
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235 PYTHON_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"
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236 fi
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237
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238 if test -z "PYTHON_LDFLAGS"; then
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239 AC_MSG_ERROR([
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240 Cannot determine location of your Python DSO. Please check it was installed with
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241 dynamic libraries enabled, or try setting PYTHON_LDFLAGS by hand.
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242 ])
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243 fi
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244 fi
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245 AC_MSG_RESULT([$PYTHON_LDFLAGS])
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246 AC_SUBST([PYTHON_LDFLAGS])
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247
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248 #
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249 # Check for site packages
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250 #
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251 AC_MSG_CHECKING([for Python site-packages path])
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252 if test -z "$PYTHON_SITE_PKG"; then
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253 PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
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254 print (distutils.sysconfig.get_python_lib(0,0));"`
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255 fi
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256 AC_MSG_RESULT([$PYTHON_SITE_PKG])
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257 AC_SUBST([PYTHON_SITE_PKG])
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258
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259 #
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260 # libraries which must be linked in when embedding
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261 #
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262 AC_MSG_CHECKING(python extra libraries)
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263 if test -z "$PYTHON_EXTRA_LIBS"; then
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264 PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
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265 conf = distutils.sysconfig.get_config_var; \
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266 print (conf('LOCALMODLIBS') + ' ' + conf('LIBS'))"`
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267 fi
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268 AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
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269 AC_SUBST(PYTHON_EXTRA_LIBS)
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270
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271 #
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272 # linking flags needed when embedding
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273 #
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274 AC_MSG_CHECKING(python extra linking flags)
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275 if test -z "$PYTHON_EXTRA_LDFLAGS"; then
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276 PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
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277 conf = distutils.sysconfig.get_config_var; \
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278 print (conf('LINKFORSHARED'))"`
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279 fi
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280 AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
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281 AC_SUBST(PYTHON_EXTRA_LDFLAGS)
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282
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283 #
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284 # final check to see if everything compiles alright
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285 #
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286 AC_MSG_CHECKING([consistency of all components of python development environment])
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287 # save current global flags
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288 ac_save_LIBS="$LIBS"
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289 ac_save_CPPFLAGS="$CPPFLAGS"
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290 LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"
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291 CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
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292 AC_LANG_PUSH([C])
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293 AC_LINK_IFELSE([
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294 AC_LANG_PROGRAM([[#include <Python.h>]],
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295 [[Py_Initialize();]])
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296 ],[pythonexists=yes],[pythonexists=no])
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297 AC_LANG_POP([C])
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298 # turn back to default flags
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299 CPPFLAGS="$ac_save_CPPFLAGS"
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300 LIBS="$ac_save_LIBS"
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301
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302 AC_MSG_RESULT([$pythonexists])
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303
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304 if test ! "x$pythonexists" = "xyes"; then
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305 AC_MSG_FAILURE([
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306 Could not link test program to Python. Maybe the main Python library has been
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307 installed in some non-standard library path. If so, pass it to configure,
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308 via the LDFLAGS environment variable.
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309 Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
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310 ============================================================================
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311 ERROR!
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312 You probably have to install the development version of the Python package
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313 for your distribution. The exact name of this package varies among them.
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314 ============================================================================
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315 ])
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316 PYTHON_VERSION=""
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317 fi
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318
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319 #
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320 # all done!
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321 #
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322 ])